Across
- 2. double loop system
- 5. allow one-way flow of air
- 6. contains yolk
- 9. Stores wastes
- 11. regulates the transport of oxygen
- 13. produces substances that are rich in fat
- 14. Type of fertilization
- 15. rely on behavior to help control body temp
- 16. Characteristics of reptiles
Down
- 1. helps mechanical breakdown
- 2. Birds can fly because of this
- 3. 1st chamber mixes acids and enzymes into food
- 4. feathers, wings, scaly legs, endotherm
- 7. egg amnion, chorion, yolk sac, allantois
- 8. carapace (dorsal) and plastron (ventral)
- 10. fluid-filled sac
- 12. contour and down